function [ status ] = mx_set_eyelink_address( )
%MX_SET_EYELINK_ADDRESS Sets the IP address used for connection to the EyeLink 
% tracker. This is set to "100.1.1.1" in the DLL, but may need to be changed 
% for some network configurations. This must be set before attempting to open 
% a connection to the tracker.
%
% Remarks:
% A "broadcast" address ("255.255.255.255") may be used if the tracker address 
% is not known - this will work only if a single Ethernet card is installed, 
% or if DLL version 2.1 or higher, and the latest tracker software versions 
% (EyeLink I v2.1 or higher, and EyeLink II v1.1 or higher) are installed.
% Parameters:
% addr 	Pointer to a string containing a "dotted" 4-digit IP address.
% Returns:
% 0 if success, -1 if could not parse address string.
%
%----------------------------------------------------------------------------
% Copyright Eduardo Aponte 2013
% aponteeduardo@gmail.com